Virgil w



2 Sheets-Sheet 1v.

(N Model.)

v. W. BLANCHARD.

STEAM BOILER.

No. 413,924. Patented ont. 29, 1889;

ci@ o" Witnesses;

(No Model.) l sheetssheen 2.

v. W. BLANCHARD. STEAM ABOILER.

NQ. 413,924. 9 [Patented 001;. 29, 1889.

V Ei FM "www www -f"'UNIT'ED VSTATES,PATENT OFFICE..

VIRGIL W. BLANCHARD, OF NEW YORK, N. Y., ASSIGNOR TO JOSEPH A.

` DAVIS, OF SAME PLACE.

' STEAM- BOILER.

. SPECIFICATION forming part of Letters .Patent No.l413,924, dated October 29, 1889.

' Applicant filed April 17, 1889. serial Np. 307,610. (No model.)

To all wiz/0711, it may concern.-

. Be it known that I, VIRGIL W. BLANCHARD,

of New York, in the county and State of New Y York, have invented certain new and useful Improvements in Steam-Boilers and I do here'.- by declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification, in which- Figure l is a diametrical sectionthrough a tubular steam-boiler having my improvement applied toit. Fig. 2 isa verticalcross-section through the same. Fig. 3 is a vertical crosssection through the compound boiler of Fig. 4; and Fig. 4 is a vertical section and part lside elevation of the compound boiler and a detail of a furnace.

This invention relates to horizontal-Hue steam-boilers; and my object is to effectually prevent the formation of scale and deposit of sediment on the interior of a boiler-shell, or

a rapid forced circulation of the water surrounding the lines in the boiler, and thereby sweeping the metal surfaces and keeping them clean.

, My object is also to increase theheatingsurfaces in a tubular steam-boiler by combining in a novel manner a series of flue-boilers, 'the shells of which are all strongly united by diaphragms which have apertures that allow a common circulation of water through the series of boilers or boiler-sections, as will be fully understood from the following description when taken in connection with the annexed 'drawin gs.

I will first Vrefer to a single tubular boiler represented by Figs. 'l and 2 of the annexed drawings.

A designates the shell of the boiler, which may be constructed in the usual well-known manner and of any desired shape. The boilershell represented in the above figures is cylindrical and provided with heads, to which the Aflue-tubes B are secured. Ata suitable point vided at a 'with a' passage for water. This diaphragm or horizontal partition C is located above the'iiues B, and it has depending from it at suitable intervals vertical partitions D', through which all of the iiues B tightly pass. These partitions do not extend entirelyT to the bottom of the boiler. Between these partitions D', and rising from the bottom of the boiler-shell, are similar vertical partitions D, which extend up nearly to the horizontal diaphragm C, and through which the fluesB tightly pass. It will thus be seen that I have a verticalcommunication a between the space above the diaphragm C, and that I have a zigzag passage in the nue-space below said diaphragm, through which water is caused to rapidly circulate.

G designates a water-forcing pump arranged outside of the boiler at the end opposite the vertical passage a through the diaphragm C. This pump may be driven by a belt from an engine which receives steam from the boiler. The exhausting-port of the pump communicates with the water-space outside of the fines B by means of a pipe P', and the opposite or forcing port of the pump communicates with the water-space above the diaphragm C and below the water-line, as shown in Fig. l.

It will be seen from the above description that when the boiler is properly charged with water and the pump put in operation there will be a rapid forced circulation of the water in the boiler, the direction of the current being indicated by the arrows onFig. l. The water will be drawn from the flue-space below the diaphragm C, through the pump, and forced back into the boiler above the diaphragm. By these means a deposit of sediment or scale is effectually prevented and a realization of the full benefit of the heating capacity of the boiler obtained.

In practice I shall provide the boiler with a mud-well S, having a cock for drawing off the sediment from time to time.v

- Figs. 3 and 4 show a compound boiler composed of a number of boiler-shells having bulging sides and united by diaphragms C, riveted to the shells. These diaphragms are arranged horizontally and provided with passages a, and the vertical partitions DD and flues are arranged precisely as described for the single tubular boiler of Fig. 1. rlhe highest section of this compound boiler is without iiues and forms a water and a steam space or dome from which steam is carried off to the engine by means of a perforated pipe E, fully described in my application for Letters Patent filed June 30, 1884, Serial No. 136,341, and not herein claimed. This compound boiler is arranged in furnace-walls R, the inclosing space communicating at its end with a furnace K by means of a passage J. The interior of the walls R is constructed with passages 7L h h leading in a tortuous course to a chimney. The lowest section of the cornpound boiler above described communicates with a pump G by means of a pipe P', and the highest section communicates with this pump by means of a pipe P. It will be observed that the circulation of water in this compound boiler when the pump is in operation will take the course indicated by the arrows on Fig. 4.

Having described my invention, I claim as newl. The combination, with a tubular steamboiler having a diaphragm C, a series of tubes below said diaphragm, and a steam-space above the same, of yan exhausting and forcing pump communicating with Iche spaces above and below said diaphragm, substantially in the manner and for the purposes described.

2. The combination, with a steam-boiler, of the diaphragm having an aperture at one end, the flues below this diaphragm, the vertical partitions in the fine-space, a pump, and its pipe-connections with the spaces above and below said diaphragm, substantially as described.

3. A compound steam-boiler consisting of a series of boiler-sections arranged one above the other and united by diaphragms, each perforated at one end, in combination with iiues, the partitions arranged as described, and a pump, substantially as described.

In testimony that I claim the foregoing as my own I aiiix my signature in presence of two witnesses.

VIRGIL XV. BLANCHARD.

lVitnesses:

ALEX. S. STEUART, A. E. DoWELL. 

